sedimentary rock
Học thuậtThân thiện
Definition
Noun: - Rock formed from consolidated clay or other sediments: A type of rock that forms at or near the Earth's surface from the accumulation, compaction, and cementation of mineral and organic particles (sediments) or from the precipitation of minerals from water.
Usage
Sedimentary rock is a fundamental geological term. It is used to describe a major rock classification and to discuss geological history, as these rocks often contain fossils and layers that record past environments. - It is typically used as a countable noun (e.g., sandstone is a sedimentary rock). - It is often discussed in contrast to igneous and metamorphic rocks.
Examples
- As a subject:
- Sedimentary rock covers a large portion of the Earth's crust.
- This sedimentary rock contains well-preserved fossils.
- As an object:
- Geologists study sedimentary rock to understand ancient climates.
- The canyon walls expose layers of sedimentary rock.
- With modifiers:
- Common types of clastic sedimentary rock include sandstone and shale.
- Limestone is a chemical sedimentary rock.
Advanced Usage
- In scientific context: The term is precise and refers to the specific process of lithification of sediments.
- The principle of original horizontality states that sedimentary rock layers are deposited horizontally.
- In a broader context: Can be used metaphorically to describe something built up in layers over time (though this is less common).
- The bureaucracy was a sedimentary rock of outdated regulations.
Variants and Related Words
- Sediment (n): The particles (like sand, silt, clay) that settle and can eventually form sedimentary rock.
- Sedimentary (adj): Of or relating to sediment or sedimentary rock (e.g., , ).
- Lithification (n): The process by which sediments compact under pressure and cement together to form solid rock.
Synonyms
- Stratified rock: Emphasizes the layered nature of many sedimentary rocks.
- Aqueous rock: An older term emphasizing formation from water.
Related Phrases/Idioms
There are no common idioms or phrasal verbs using "sedimentary rock." It is a technical compound noun.
Noun
- rock formed from consolidated clay sediments